Tub enclosure



FIG. 1 is a perspective view of the tub enclosure showing my new design;

FIG. 2 is a front view thereof; and,

FIG. 3 is a top plan view thereof.

The broken lines showing of the tub is for illustrative purposes only and forms no part of the claimed design. 

An ornamental design for a tub enclosure, as shown and described. 